大别山北麓斑岩型钼矿床地质特征、成矿时代及其成矿构造背景  

Geologic Features,Mineralization Epoch and Tectonic Setting of Molybdenum Deposits in the Northern Dabie Mountains

作　　者：刘清泉[1,2,3] 张智慧 李永峰 罗正传 谢克家 

机构地区：[1]中南大学地球科学与信息物理学院,有色金属成矿预测教育部重点实验室,湖南长沙410083 [2]河南省有色金属矿产探测工程技术研究中心,河南郑州450016 [3]河南省有色金属地质勘查总院,河南郑州450052

出　　处：《地质与勘探》2014年第2期199-215,共17页Geology and Exploration

基　　金：中国地质调查局项目(12120113091200);国土资源公益性行业科研专项项目(20111107-2);河南省有色金属地质矿产局科技创新项目(ysdk2012-6)联合资助

摘　　要：在野外调查和测试分析的基础上,结合前人的研究成果,综合论述了大别山北麓斑岩型钼矿床的地质特征、形成时代和构造背景。大别山北麓斑岩型钼矿床总体沿区域构造线呈北西向狭长带状展布,具有近东西向成带、南北向成群的空间展布特征,其形成与燕山期中酸性浅成-超浅成小型花岗斑岩体有关,钼矿床直接产于岩体内外接触带及其附近的围岩中,矿床类型主要为斑岩型、斑岩-矽卡岩型及少量热液石英脉型。结合Re-Os同位素年龄数据,探讨了大别山北麓斑岩型钼矿床的成矿物质来源、成矿流体、成矿时代、主要成矿作用的时限以及成矿地球动力学背景。结果表明:大别山北麓地区钼矿床的主要成矿作用时限为142~137 Ma和127~110 Ma,对应的地球动力学背景为中国东部地球动力学体制大转换晚期的岩石圈拆沉及伸展减薄的构造背景。On the basis of field investigations,combining with previous research results,this paper presents geological features,formation ages and tectonic setting of molybdenum deposits in the northern Dabie Mountains,which are characterized by extension in east-west direction as narrow belts and in north-south direction as groups. They are genetically related to Yanshanian intermediate-acid granites distributed extensively in the northern Dabie Mountains and along the inner and outer contact zones of the porphyry. The molybdenum deposits are mainly of porphyry and porphyry-skarn types and subordinately of quartz vein type. The constrained ore-forming ages of the molybdenum deposits in the northern Dabie Mountains are 142 ~ 137 Ma and127 ~ 110 Ma,respectively. Their geodynamic setting is lithospheric delamination,extension and thinning during the transformation of the tectonic regime in East China.

关 键 词：大别山北麓 钼矿床特征 成矿时代 成矿背景 

分 类 号：P618.65[天文地球—矿床学]